No matter what if you grow in coco/perlite your going to have to buy nutrients, I honestly believe dry amendments is best for coco, but as you said you don't have access to 99% of them. If you don't want to use dry amendments then I would suggest Nectar Of The Gods. It's a really good bottled organic nutrient.
You could also look up Mr Canucks Grow on YouTube. He grows organic and teaches every step and its super easy. But again even tho its coco/perlite he still adds powdered nutrients he buys.
Honestly you should see what can be shipped to you or what you do have access to so everyone could give you opinions on what's available to you.